JP3258946B2 - Liquid crystal display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display having a substrate on which components constituting a video signal processing circuit and an LCD driving circuit are mounted.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional liquid crystal display device. This device comprises an LCD panel 1, a backlight 2,
It is configured by stacking substrates 3 on which components constituting a video signal processing circuit and an LCD drive circuit are mounted. Substrate 3
Is connected via a cable 4 to a main body of a video camera, a digital still camera, a handy terminal or the like, and the liquid crystal display device is incorporated in the main body.

[0003]

However, in the stacked structure as described above, there has been a problem that it is difficult to reduce the thickness due to the thickness of the components mounted on the substrate 3.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks, and comprises an LCD panel, a light guide plate having a side surface formed in a wedge shape and disposed behind the LCD panel, and a light guide plate. A substrate disposed behind the light plate, a tall component is disposed at a position where the thickness of the light guide plate is thinner, and a substrate where a shorter component is disposed at a position where the thickness of the light guide plate is thicker. The substrate and the LCD panel are connected by a flat cable,
The flat cable solves the above-mentioned problem by a crystal display device, wherein the light guide plate is connected to the LCD panel from a thicker side.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing an embodiment of the liquid crystal display device according to the present invention, FIG. 2 is a block diagram showing a circuit on the substrate of FIG. 1, and FIG. 3 is an explanation showing an arrangement of components constituting the circuit of FIG. FIG. In FIG. 1, a display surface is above the LCD panel 11, and a lens film 12, a diffusion plate 13, a light guide plate 14 having a wedge-shaped side surface, and a substrate 15 are arranged on the opposite side of the display surface of the LCD panel 11. A lamp 16 is disposed on the edge side of the light guide plate 14 where the thickness is larger, and the light guide plate 14 and the lamp 16 constitute a backlight.

A tall component 17a is arranged on the substrate 15 at a position where the thickness of the light guide plate 14 is thinner, and a position where the thickness of the light guide plate 14 is thicker, that is, the lamp 1 is provided.
A short component 17b is arranged on the sixth side. Substrate 15
Is connected to the LCD panel 11 via a flat cable 18, and at this time, the flat cable 18 is arranged on the lamp 16 side.

As shown in FIG. 2, an input connector 21, a crystal oscillator (x'tal) 22, an RGB decoder 23, an RGB driver 24, a timing controller 25, a voltage controlled oscillator (VCO) 28, a buffer 26 ,
A level shift circuit 27, an output connector 29, and the like are provided. The RGB decoder 23 converts a video signal input from the outside via the input connector 21 into an RGB signal.
A signal having a frequency of 58 MHz is generated.

The RGB driver 24 is an RGB decoder 23
Inverts the RGB signal converted by
11 by performing amplification, gamma correction, etc. according to the characteristics of
It is converted to an FT liquid crystal drive dedicated signal and this is output to connector 2
9. Output to the LCD panel 11 via the flat cable 18. The timing controller 25 uses the PLL circuit based on a synchronization signal included in a video signal input from the outside via the input connector 21 to control the LCD panel 11
Generates a horizontal and vertical timing pulse (start pulse, dot clock) and the like necessary for driving the VCO, and the VCO 28 generates a signal of a frequency necessary for the PLL.

The buffer 26 is a timing controller 2
The impedance of the various control signals (precharge signal, counter electrode drive signal) generated by 5 is lowered so that the liquid crystal load in the LCD panel 11 can be driven, and the level shift circuit 27 is generated by the timing controller 25. The amplitude (5V) of various timing signals
The voltage is converted to the required 15 V in the D panel 11. Buffer 2
6 and the output signal of the level shift circuit 27 are output to the LCD panel 11 via the output connector 29 and the flat cable 18.
Is output to The components making up such a circuit are
1 and 3, the light guide plate 14 has a thinner part 17a disposed at a position where the thickness of the light guide plate 14 is smaller as shown in FIGS. And ICs (23, 24) constituting the RGB decoder 23 and the RGB driver 24 are arranged.
Also, the output connector 29 as a medium-height component,
An IC (27) and the like constituting the level shift circuit 27 are arranged, and various chip components 30 are arranged as a short component 17b arranged at a position where the light guide plate 14 is thicker, that is, at the lamp 16 side. You. One end of the flat cable 18 is connected to the output connector 29, the light guide plate is turned around the lamp 16 from the thicker side, and the other end is
Connected to CD panel 11. Since circuit components cannot be arranged on components through which the flat cable 18 passes on the substrate 15, by turning the flat cable 18 from the thicker one of the light guide plate 14 and connecting it to the LCD panel 1 as shown in FIG. Tall parts can be arranged by effectively using the thinner part of 14.

[0010]

As described above, according to the liquid crystal display device of the present invention, a light guide plate having a thin wedge-shaped light guide plate on its side is disposed on a substrate, Since the low-profile components are arranged at the position where the thickness is larger, the thickness can be reduced.

[Brief description of the drawings]

FIG. 1 is a side view showing one embodiment of a liquid crystal display device according to the present invention.

FIG. 2 is a block diagram showing a circuit on the substrate of FIG. 1;

FIG. 3 is an explanatory diagram showing an arrangement of components constituting the circuit of FIG. 2;

FIG. 4 is an external view showing a conventional liquid crystal display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 LCD panel 12 Lens film 13 Diffusion plate 14 Light guide plate 15 Substrate 16 Lamp 17a Tall part 17b Tall part 18 Flat cable

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-8-62426 (JP, A) JP-A-11-86623 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G02F 1/13357 G02F 1/1333 G02F 1/1345

Claims (1)

(57) [Claims] 1. An LCD panel, a light guide plate having a side surface formed in a wedge shape and arranged behind the LCD panel, and a position arranged behind the light guide plate and having a smaller thickness of the light guide plate A liquid crystal display device having a substrate on which a tall component is disposed and a low component disposed at a position where the light guide plate is thicker , wherein the substrate and the LCD panel are connected by a flat cable.
The flat cable is arranged such that the thickness of the light guide plate is
Liquid crystal connected to an LCD panel
Display device.